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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - Common Stock - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity    
Number of shares repurchased 44,543 28,256
Equity Distribution Agreements    
Equity    
Maximum offering capacity under shelf registration statement $ 200,000,000  
Shares common stock sold 0  
Amount available under effective shelf registration statement $ 200,000,000